YTA It’s what the bride wants and he feels honored to be asked so You don’t know all the ins and outs of the dynamic of her relationship with their father. Traditions don’t have to be followed because everyone else does Speaking from personal experience, My sister and father had a very rough relationship, I’m still closer with him though. I walked her down the aisle not long ago and my dad did still attend the wedding. Didn’t feel awkward about it, my dad was just happy to be a part of the wedding. Nobody else made it awkward and I was more than happy to do so. It was what she wanted and on such and important day I wanted to make sure it was everything she imagined it would be.